Pump.fun Direct Trading on Solana — Bypassing Jupiter for Faster Snipes

#solana #crypto #defi #javascript

Why Direct Trading?

When a token launches on Pump.fun, it trades on a bonding curve before graduating to Raydium. During this phase, Jupiter can't route to it. You need to interact with the bonding curve directly.

The Bonding Curve

Pump.fun uses a constant product bonding curve. The price increases as more tokens are bought.

price = virtualSolReserves / virtualTokenReserves

Direct Buy Implementation

const { Connection, PublicKey, Transaction } = require('@solana/web3.js');

async function buyOnPumpFun(mintAddress, amountSOL, wallet) {
  const conn = new Connection('https://api.mainnet-beta.solana.com');

  // Fetch bonding curve data
  const bondingCurve = await getBondingCurveAccount(mintAddress);

  // Calculate tokens received
  const tokensOut = calculateTokensOut(
    amountSOL,
    bondingCurve.virtualSolReserves,
    bondingCurve.virtualTokenReserves
  );

  // Apply slippage (e.g., 5%)
  const minTokens = tokensOut * 0.95;

  // Build transaction with Pump.fun program instruction
  const tx = new Transaction();
  tx.add(createBuyInstruction({
    mint: new PublicKey(mintAddress),
    bondingCurve: bondingCurve.address,
    amount: amountSOL * 1e9, // lamports
    minTokens,
    wallet: wallet.publicKey,
  }));

  // Send via Jito for MEV protection
  await sendWithJito(tx, wallet);
}